EP0374870A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Acceleration sensor
Assignee: Mitsubishi Electric Corp
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Filing: 1989-12-20
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Granted: —
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Expires: 2009-12-20
Abstract
Abstract An acceleration sensor is disclosed which includes a weight (2), piezoelectric element(s) (4), a charged amplifier (6), an insulation plate (9) and a conductive casing (1). The insulation plate (9) fixedly mounts the weight (2) and piezoelectric element(s) (4) and is fixed to the conductive casing (1) which is maintained at the earth potential. Input terminals (13, 14) of the charged amplifier are connected to the output electrodes (3a, 3b) of the element(s) and a grounding circuit of the amplifier is connected to the conductive casing (1) so that the input terminals of the amplifier are floated from the earth potential.
Inventors
- 👤 Shunichi C/O Himeji Seisakusho Wada
- 👤 Masayuki C/O Himeji Jigyosho Yano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:53
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/006; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
An acceleration sensor comprising: weight means; piezoelectric means for generating a signal by a pressure load caused by said weight means depending on the rate of acceleration; charged amplifier means connected to said piezoelectric means for amplifying said signal generated by said piezoelectric means; a conductive casing the potential of which is maintained at the earth level; and an insulation plate for fixedly mounting said weight means and piezoelectric means, and being fixed to said conductive casing, wherein a grounding circuit of said charged amplifier means is coupled to said conductive casing so that input terminals of said amplifier keep floating from said earth level.
Claim 2
Dependent Claim
105 words
An acceleration sensor comprising: weight means; piezoelectric means for generating a signal by a pressure load caused by said weight means depending on the rate of acceleration; charged amplifier means connected to said piezoelectric means for amplifying said signal generated by said piezoelectric means; a conductive casing the potential of which is maintained at the earth level; and an insulation plate for fixedly mounting said weight means and piezoelectric means, and being fixed to said conductive casing, wherein a grounding circuit of said charged amplifier means is coupled to said conductive casing so that input terminals of said amplifier keep floating from said earth level.
Claim 3
Dependent Claim
41 words
An acceleration sensor according to Claim 1, further comprising metallic rigid means for supporting said weight means and piezoelectric means, wherein said weight means, piezoelectric means and metallic rigid means are together fixed to said insulation plate by a fixing means.
Claim 4
Dependent Claim
44 words
An acceleration sensor according to Claim 2, wherein said metallic rigid means have an U-shaped portion, said insulation plate is inserted in said U-shaped portion and said weight means, piezoelectric means and rigid means are fixed at the inserted portion of said insulation plate.
Claim 5
Dependent Claim
19 words
An acceleration sensor according to Claim 1, wherein said piezoelectric means comprises two piezoelectric elements electrically connected in parallel.
Claim 6
Dependent Claim
22 words
An acceleration sensor according to Claim 4, wherein said two piezoelectric elements are serially located between said weight means and insulation plate.
Claim 7
Dependent Claim
48 words
An acceleration sensor according to Claim 2, wherein said piezoelectric means comprises two piezoelectric elements electrically connected in parallel and serially located between said weight means and insulation plate, and said fixing means comprises a metallic screw and a nut, whereby said two piezoelectric elements are thermally balanced.
Claim 8
Dependent Claim
56 words
An acceleration sensor according to Claim 3, wherein said piezoelectric means comprises two piezoelectric elements electrically connected in parallel and serially located between said weight means and insulation plate through a part of said metallic rigid means, and said fixing means comprises a metallic screw and a nut, whereby said two piezoelectric elements are thermally balanced.
Claim 9
Dependent Claim
24 words
An acceleration sensor according to Claim 1, wherein said insulation plate comprises a printed circuit board onto which said charged amplifier means is mounted.
Claim 10
Dependent Claim
86 words
An acceleration sensor according to Claim 1, wherein said charged amplifier means comprises a first capacitor for converting said charge signal from said piezoelectric means to a voltage signal and a differential amplifier the positive input terminal of which is connected to a first electrode of said first capacitor, the negative input terminal of which is connected to a second electrode of said first capacitor through a first resistor and said negative input terminal and the output terminal of which are connected through a second resistor.
Claim 11
Dependent Claim
42 words
An acceleration sensor according to Claim 9, wherein said charged amplifier means further includes a second capacitor connected between said negative input terminal and output terminal of said differential amplifier, whereby said second capacitor and said second resistor form a low-pass filter.
Claim 12
Dependent Claim
35 words
An acceleration sensor according to Claim 9, wherein said charged amplifier means further includes a third resistor connected in parallel to said first capacitor, whereby said third resistor and first capacitor form a highpass filter.
References Cited (Backward Citations)
No citation records indexed.
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